Air conditioning, empty-room echo, electrical hum: audio problems you only notice after the shoot can be reduced a lot in the edit. Premiere Pro has ready-made tools for this; what matters is not overdoing it.
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This is the fastest route. Select the clip and tag it as Dialogue in Window › Essential Sound. The Repair section opens.
Start the sliders low and raise them while listening. Too much noise reduction makes a voice sound metallic and underwater.
For more control, drag the DeNoise, DeReverb, DeHummer and DeEsser effects from Audio Effects in the Effects panel onto the clip and adjust them in Effect Controls. The Essential Sound sliders use effects of this kind behind the scenes.
In Sylba's Studio › Audio section the cleanup tools sit in one list: Reduce noise, Remove room echo, Remove hum and Soften "S" sounds. They all add Premiere Pro's own audio effects, so you can see and adjust the result in Effect Controls.
For a quick fix on a single clip, Essential Sound is enough. If you want every setting of the effect, add it by hand. When you want to try a few tools and decide by ear, picking from one list saves time.
Listen on headphones first; noise you can't hear on speakers shows up there. Clean the audio before adding music and effects. And remember: cleanup rescues a bad recording but does not replace a good one; moving the microphone closer beats any effect.
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